[R] geom_tile rendering problems

[rayzlor]

Hi, I'm trying to overlay a geographical map with a heat map by following the
directions on
http://pages.stern.nyu.edu/~achinco/programming_examples/Example__PlotGeographicDensity.html.

However, the smaller my zoom level (the farther I zoom out), the more white
horizontal lines I have interspersed in the tiled data after calling
geom_tile.  Is there any way around this?  I tried setting the image to
panel.background, but found it impossible to scale back to the original heat
map matrix.

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